DetailsThis is a physiological salt based around the 4 major salts that freshwater fish need to thrive. By adding salt to a pond you relieve stress (Osmotic) on the fish. The Methylene blue in the product allows nitrite from water to be removed. It can be used to support other treatments such as Anti Parasite. Acts as a pH buffer, prevents damaging swings in pH whilst maintaining neutral stable levels for pond fish.